The dielectric spectrum of erbium doped CaF2
- 28 March 1976
- journal article
- Published by IOP Publishing in Journal of Physics C: Solid State Physics
- Vol. 9 (6) , 1055-1064
- https://doi.org/10.1088/0022-3719/9/6/022
Abstract
The complex dielectric constant has been measured at five audio frequencies (102-104 Hz) over the temperature range 4.2-400K for eight concentrations (0.001-3.0 mol%) of erbium in calcium fluoride. Relaxation processes with activation energies of about 0.15, 0.4, 0.5 and 0.7 eV have been observed which correspond to previously reported dipolar complexes in rare-earth doped alkaline-earth fluorides. In addition, a previously unreported relaxation with an activation energy of approximately 0.028 eV has been found at low temperatures and high rare-earth concentrations. It is concluded that this relaxation is cluster-associated.Keywords
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